How long should I run my melanger for chocolate?

Run the melanger a minimum of 18–24 hours for a finished bar. Nanci at Chocolate Alchemy identifies 30 hours as the optimal flavor development point, with diminishing returns after. For a first batch, run 24 hours and taste. If gritty, run an additional 6 hours. A grindometer reading of 10–20 microns is the target — that is when texture is objectively smooth.

Why does the melanger make so much noise at the start?

The loud grinding noise at the start is normal — you are hearing the granite rollers crushing large nib particles (100–1,000 microns) against the granite base. As refining progresses and particles get smaller, the noise gradually diminishes. By 2–4 hours, the mass is usually fluid enough that the noise changes to a smoother, lower sound.

When should I add sugar to the melanger?

Add sugar after the nibs have formed a rough paste and fat has begun to release — typically 20–30 minutes into the run. Add it gradually in 3–5 additions over the next 30–60 minutes. Adding sugar too early, before the fat is liberated, creates a dry, crumbly mass that does not flow under the rollers properly.

What is the right particle size for finished chocolate?

The target is 10–20 microns. Humans cannot detect grittiness below approximately 30 microns (Beckett Science gives ~30 microns as the threshold; Dandelion gives 20–35 microns). Over-refining below about 5 microns makes chocolate taste gummy. Use a TQC grindometer to measure particle size objectively rather than relying on time or texture alone.

Should I run the melanger with the lid on or off?

Lid on preserves volatile aromatics and fruity notes — better for bright, acidic origins. Lid off allows faster evaporation of volatile acids, producing rounder, mellower flavor. A common approach is lid on for the first 8–12 hours of refining, then lid off for the conching phase to allow controlled acid reduction.

What should I do if my melanger seizes?

Apply external heat immediately with a heat gun or hair dryer aimed at the outside of the drum. Keep the motor running if possible. Once warm, the mass should become fluid again. The most common cause is the mass cooling enough for fat to solidify. Never add water to a seized melanger — water causes permanent, unrecoverable seizing.

Grinding Chocolate in a Melanger: Complete Guide

The melanger refines cocoa nibs and sugar into smooth chocolate by pressing them between granite rollers and a granite base. Load nibs first, run 20 to 30 minutes until a paste forms, then add sugar gradually. Run 18 to 24 hours minimum for a finished bar; 30 hours reaches the optimal flavor development point. Target particle size is 10 to 20 microns. Never add water.

How the Melanger Reduces Particle Size

The granite rollers sit in the drum on a flat granite base plate. As the drum rotates, material is swept under the rollers, which press down under their own weight plus the weight of the mass above them. The combination of compressive force and shear reduces particle size through physical fracture.

This mechanism is fundamentally different from a blender or food processor, which cut and impact particles without the sustained compression needed to reach sub-30-micron size. A melanger running at full load exerts hundreds of pounds of force per square inch on the particles under the rollers. This is how 1,000-micron nib pieces become 15-micron chocolate particles over 18 to 30 hours.

There is no chemical reaction happening. The transformation is entirely mechanical: smaller particles, more fat liberated, more surface area coated in cocoa butter. The result is the texture that defines smooth chocolate.

Loading the Melanger

Preheat the bowl (recommended): Heat the empty melanger bowl to approximately 160°F using a heat gun, hair dryer, or brief oven warm-up. Cold granite requires significant energy to warm up, which the fat in the nibs provides slowly. Pre-warming speeds the initial loading phase considerably.

Load nibs first: Add nibs to the warm bowl and run for 20 to 30 minutes without sugar. The fat in the nibs releases — initially you see dry pieces that gradually clump, then form a rough paste as fat is liberated. Do not rush this step. Adding sugar too early, before fat has been sufficiently released to form a paste, can cause the mix to stay too dry and not flow under the rollers properly.

Add sugar gradually: Once a paste has formed and is flowing under the rollers, add sugar slowly in 3 to 5 additions over the next 30 to 60 minutes. This gradual addition prevents the mass from becoming suddenly dry (sugar is hydroscopic and absorbs the surface fat temporarily as it disperses).

Formula: For 70% two-ingredient chocolate: Sugar = (Nib weight / 0.70) - Nib weight

At 650g nibs: (650 / 0.70) - 650 = 279g sugar.

The Refining Timeline

Different things happen at different points in a melanger run:

0 to 2 hours: The mass is chunky and rough. The rollers make loud grinding noises as they work on large particles. This is normal. The fat gradually releases and the mass becomes more fluid.

2 to 6 hours: The mass is flowing regularly under the rollers. Particle size is still well above the grittiness threshold — probably 50 to 100 microns. The chocolate tastes gritty and has a rough, pasty texture.

6 to 10 hours: First checks with a grindometer should show 25 to 40 microns. The aroma is developing — brighter, more acidic notes from volatile acids present in the mass.

10 to 18 hours: The grindometer reading approaches 20 to 25 microns. The chocolate is becoming genuinely smooth. Flavor is developing; the mechanical energy and air exposure are conching as refining continues.

18 to 24 hours: At this point for most origins, you have reached 10 to 20 microns and the chocolate is smooth, with good flavor development. This is the minimum recommended endpoint for a finished bar.

24 to 30 hours: Continued conching develops flavor further. Bright, sharp, acidic notes diminish; warmer tones (caramel, molasses, roasted notes) emerge. Nanci identifies this range as the optimal flavor window.

After 30 hours: Diminishing returns on flavor development. The chocolate may not get significantly better with more time in the melanger.

Lid On or Lid Off?

This is one of the genuinely contested variables in craft chocolate making.

Lid on: Preserves volatile aromatics in the mass. If you want to keep bright, fruity, acidic notes, leave the lid on. This slows the conching effect of the melanger. Good for fruit-forward origins like Madagascar or Peruvian Piura.

Lid off: Allows faster evaporation of volatile acids and aromatics. If you want to reduce acidity and develop rounder, more mellow flavors, run with the lid off for part of the cycle. Dandelion recommends lid-off running for faster acid removal.

Most craft makers do lid-on for the first 8 to 12 hours (refining phase) and lid-off for the latter portion (conching phase). The transition point depends on your flavor goals.

When to Add Sugar

Adding sugar at the beginning of the run — before fat has been liberated from the nibs — leads to a dry, crumbly mass that is hard to get flowing. This can cause the rollers to spin without effective contact with material, reducing particle reduction efficiency.

Dandelion notes an interesting effect: adding sugar appears to “freeze” the flavor state of the chocolate at that moment. The flavor development that was in progress when sugar was added is preserved, and flavor continues to develop from that baseline. This suggests that timing sugar addition is a subtle flavor control variable.

Seizing: The Emergency

If the melanger seizes — the drum stops turning, the motor struggles, or the mass becomes a solid paste that stops flowing — the most common cause is that the mass cooled enough for the fat to solidify.

Apply external heat immediately: a heat gun or hair dryer aimed at the outside of the drum. Keep the motor running if possible to maintain roller movement. Once warm, add a small amount of nibs or add the mass gradually back in.

Never add water. Nanci’s absolute rule: “the no-water absolute rule.” Water causes permanent seizing that the machine cannot recover from.

Particle Size Testing During a Run

A TQC grindometer is the best tool for measuring particle size during a run. The target for craft chocolate is 10 to 20 microns. The grittiness detection threshold is approximately 30 microns.

Sample the chocolate at 6, 12, 18, and 24 hours for your first batches. This builds a refining curve for your specific machine, origin, and formulation. Once you know that your Spectra 11 reaches target particle size at 22 hours with a specific bean, time becomes a reliable guide.

For equipment selection, see our best melanger guide and melanger comparison article. For understanding why particle size matters physically, see our grindometer and particle size guide. For what happens to flavor during the conching portion of the melanger run, see our conching guide.

Frequently Asked Questions

How long should I run my melanger for chocolate?: Run the melanger a minimum of 18–24 hours for a finished bar. Nanci at Chocolate Alchemy identifies 30 hours as the optimal flavor development point, with diminishing returns after. For a first batch, run 24 hours and taste. If gritty, run an additional 6 hours. A grindometer reading of 10–20 microns is the target — that is when texture is objectively smooth.
Why does the melanger make so much noise at the start?: The loud grinding noise at the start is normal — you are hearing the granite rollers crushing large nib particles (100–1,000 microns) against the granite base. As refining progresses and particles get smaller, the noise gradually diminishes. By 2–4 hours, the mass is usually fluid enough that the noise changes to a smoother, lower sound.
When should I add sugar to the melanger?: Add sugar after the nibs have formed a rough paste and fat has begun to release — typically 20–30 minutes into the run. Add it gradually in 3–5 additions over the next 30–60 minutes. Adding sugar too early, before the fat is liberated, creates a dry, crumbly mass that does not flow under the rollers properly.
What is the right particle size for finished chocolate?: The target is 10–20 microns. Humans cannot detect grittiness below approximately 30 microns (Beckett Science gives ~30 microns as the threshold; Dandelion gives 20–35 microns). Over-refining below about 5 microns makes chocolate taste gummy. Use a TQC grindometer to measure particle size objectively rather than relying on time or texture alone.
Should I run the melanger with the lid on or off?: Lid on preserves volatile aromatics and fruity notes — better for bright, acidic origins. Lid off allows faster evaporation of volatile acids, producing rounder, mellower flavor. A common approach is lid on for the first 8–12 hours of refining, then lid off for the conching phase to allow controlled acid reduction.
What should I do if my melanger seizes?: Apply external heat immediately with a heat gun or hair dryer aimed at the outside of the drum. Keep the motor running if possible. Once warm, the mass should become fluid again. The most common cause is the mass cooling enough for fat to solidify. Never add water to a seized melanger — water causes permanent, unrecoverable seizing.